51642229 has 2 divisors, whose sum is σ = 51642230. Its totient is φ = 51642228.

The previous prime is 51642211. The next prime is 51642233. The reversal of 51642229 is 92224615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 161604 = 7175^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 51642229 - 2⁵ = 51642197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51642229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51642029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821114 + 25821115.

It is an arithmetic number, because the mean of its divisors is an integer number (25821115).

Almost surely, 2^51642229 is an apocalyptic number.

It is an amenable number.

51642229 is a deficient number, since it is larger than the sum of its proper divisors (1).

51642229 is an equidigital number, since it uses as much as digits as its factorization.

51642229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 51642229 is about 7186.2527787436. The cubic root of 51642229 is about 372.3931294095.

The spelling of 51642229 in words is "fifty-one million, six hundred forty-two thousand, two hundred twenty-nine".